Question 1

Their high production of ________ make microalgae valuable for the production of biofuel.

Accepted Answer

Triglycerides, which are fats or lipid molecules, are the main component of microalgae that can be converted into biofuel. They are generally produced in high quantities by microalgae and can be extracted relatively easily for biofuel production.

Question 2

The ancestors of this organism first appeared in the fossil record about 3.5 billion years ago and has phycobillin accessory pigments.

Accepted Answer

The presence of phycobillin accessory pigments indicates that this organism is a photosynthetic prokaryote, and the only option that fits this description is a cyanobacterium. Additionally, cyanobacteria are known to have first appeared in the fossil record about 3.5 billion years ago, further supporting this choice.

Question 3

All of the following correctly pair up an organism with a unique structure or compound it possesses except one.Choose the exception.

Accepted Answer

Green algae do not possess a unique structure or compound called conceptacles. Conceptacles are actually a structure found in brown algae where they contain reproductive cells.

Question 4

In the life cycle of a green alga,meiosis specifically occurs in the ________.

Accepted Answer

The answer of In the life cycle of a green...

Question 5

In the life cycle of a green alga,syngamy occurs between which of the following?

Accepted Answer

Syngamy, also known as fertilization, occurs between gametes in the life cycle of a green alga. The fusion of two haploid gametes, one from each parent, results in the formation of a diploid zygote.

Question 6

The most common thallus types include which of the following?

Accepted Answer

All the options listed (A through D) describe various forms of thalli (plural of thallus) that can be found in algae, indicating the diversity in their physical structures and modes of movement or growth.

Question 7

Many cyanobacteria are enclosed in a ________ sheath.

Accepted Answer

Cyanobacteria are surrounded by a mucilaginous sheath that protects them and helps them adhere to surfaces in aquatic environments.

Question 8

The Kingdom Protista is probably polyphyletic.Which of the following protist groups is not correctly matched?

Accepted Answer

Chlorophyta (green algae) is not correctly matched with blue-green bacteria, as blue-green bacteria (cyanobacteria) are actually prokaryotes and not classified within the Kingdom Protista.

Question 9

In which of the following way(s)does (do)the algae differ from land plants?

Accepted Answer

The term "embryophyte" refers specifically to land plants that have a developing embryo, which algae do not have. Therefore, option D is the correct choice. Option A is incorrect because algae do have cell walls, although they may be structurally different from those of land plants. Option B is incorrect because chlorophyll a is present in most algae, although they may also have other pigments. Option C is incorrect because all algae are capable of photosynthesis to varying degrees.

Question 10

Which of the following statements is correct?

Accepted Answer

Diatoms reproduce sexually through a process involving gamete formation, not merely cell division. They are abundant in both cold and tropical oceans, making statement B incorrect. Brown algae encompass more than just kelps, so statement C is incorrect. The Phaeophyta, or brown algae, are among the more complex algae, especially in terms of structure, thus D is incorrect. The correct statement is E, as in Fucus, a type of brown algae, the swollen areas at the ends of the blades are indeed reproductive structures known as receptacles.

Question 11

Ulva is both ________ and ________.

Accepted Answer

Ulva is a genus of green algae that is both isogamous (having two identical gametes) and isomorphic (having a similar appearance in their haploid and diploid phases). The options B, C, and E are incorrect because Ulva does not demonstrate anisogamy, heteromorphism, or oogamy.

Question 12

You discover a single-celled organism living in a tide pool encased within a glassy wall-like shell.It has a centric shape.You have likely discovered which of the following?

Accepted Answer

Diatoms are single-celled organisms that have a glass-like wall called a frustule, which can have intricate patterns and shapes. Diatoms also have a centric shape, meaning they are symmetrical along their central axis. The other options listed do not commonly have glassy walls or a centric shape.

Question 13

Which of the following statements is(are)correct about the algae?

Accepted Answer

All of the statements are correct. Algae is a diverse group of photosynthetic organisms that range in size from microscopic single cells to giant, complex, multicellular organisms. They occupy the base of food chains in both freshwater and marine ecosystems and have been used as food for humans throughout the world.

Question 14

A heterocyst is a cell specialized for which of the following functions?

Accepted Answer

Heterocysts are specialized cells found in some cyanobacteria that are involved in nitrogen fixation. They contain enzymes that convert atmospheric nitrogen into a form that can be used by the organism.

Question 15

You discover a flagellated single-celled organism living in a freshwater pond.It has a greenish color,a pellicle,a short flagellum and a long flagellum,and a large red eye spot.You have likely discovered which of the following?

Accepted Answer

The organism described has a greenish color, a pellicle (a rigid layer that helps maintain its shape), and a short flagellum and a long flagellum for locomotion. These are all characteristics of the genus Euglena, which are flagellated single-celled organisms that can photosynthesize using chloroplasts. The large red eye spot is also a characteristic of Euglena.

Question 16

You discover a single-celled organism living in a freshwater pond.It is covered in cellulose plates and has two flagella.You have likely discovered which of the following?

Accepted Answer

Dinoflagellates are characterized by their cellulose plates and two flagella, which match the description given.

Question 17

From which of the following did land plants evolve?

Accepted Answer

Land plants are believed to have evolved from green algae, specifically Chlorophytes. Studies have shown that there are many similarities between the two, including the structure of chloroplasts and the presence of cell walls made of cellulose.

Question 18

Diatoms,in the division Bacillariophyta,are mainly unicells surrounded by a silicon-based wall consisting of two halves,called a(n)________.

Accepted Answer

Diatoms are surrounded by a unique cell wall made of silica, which is not correctly described by any of the terms provided in the options (A) oogonium, (B) ephyra, (C) radula, or (D) fructification. The correct term for this silica-based wall is "frustule," which is not listed among the choices.

Question 19

When does sexual reproduction occur in diatoms?

Accepted Answer

Sexual reproduction in diatoms occurs after one of the frustule halves reaches a certain size. This triggers the formation of gametes, which can fuse to form a zygote. The frustule halves then separate to allow the zygote to develop into a new diatom individual. The other options (A, B, D) are not accurate descriptions of the sexual reproduction process in diatoms.

Question 20

Based on genetic studies,the living genus of algae that most closely resembles the evolutionary ancestor of land plants is which of the following?

Accepted Answer

Genetic studies suggest that Coleochaete is the living genus of algae that is most closely related to the ancestor of land plants. Coleochaete shares many characteristics with land plants, such as the presence of cellulose in their cell walls and the ability to produce multicellular structures.

Quiz 22: The Algae