Question 1

Which of the following statements best explains why Archaea are considered more closely related to Eukaryotes than to Bacteria?

Accepted Answer

Archaea and Eukaryotes share similarities in their RNA polymerase subunits.

Question 2

A researcher discovers a new single-celled organism with a nuclear envelope and mitochondria. Based on these features, to which group does this organism most likely belong?

Accepted Answer

Eukaryotes

Question 3

Which of the following is a key evolutionary advantage of multicellularity over unicellularity?

Accepted Answer

Increased cell specialization and division of labor

Question 4

Which of the following best describes the group known as 'protists'?

Accepted Answer

A polyphyletic group of mostly single-celled eukaryotes

Question 5

A scientist is comparing the RNA polymerase enzymes of three organisms: a bacterium, an archaeon, and a eukaryote. Which of the following findings would support the current understanding of evolutionary relationships?

Accepted Answer

The archaeon's RNA polymerase is more similar to the eukaryote's than to the bacterium's.

Question 6

Which of the following is NOT a characteristic that distinguishes eukaryotes from prokaryotes?

Accepted Answer

Formylmethionine as the initiator amino acid in protein synthesis

Question 7

Consider a population of single-celled organisms that, after cell division, remain attached to each other. Over time, some cells begin to specialize for different functions. Which evolutionary process is this scenario describing?

Accepted Answer

The origin of multicellularity

Question 8

Which of the following best explains why multicellular organisms can achieve larger body sizes than unicellular organisms?

Accepted Answer

Cell specialization allows for division of labor and structural support.

Question 9

A student claims that all eukaryotes are multicellular. Which of the following is the best response to this claim?

Accepted Answer

This is incorrect because many eukaryotes, such as protists, are single-celled.

Question 10

Which of the following features is shared by both Archaea and Eukaryotes, but not by Bacteria?

Accepted Answer

Methionine as the initiator amino acid in protein synthesis

Question 11

If a biologist is constructing a phylogenetic tree using DNA sequence similarity, which of the following would most likely be grouped together?

Accepted Answer

Archaea and Eukaryotes

Question 12

Which of the following is a real-world example of the advantage of cell specialization in multicellular organisms?

Accepted Answer

A plant root cell absorbing water while a leaf cell performs photosynthesis

Question 13

Which of the following statements about the evolutionary history of life is supported by molecular evidence?

Accepted Answer

Archaea and Eukaryotes share a more recent common ancestor with each other than with Bacteria.

Question 14

A multicellular organism is observed to have cells that remain attached after division and show differentiation. Which of the following equations best represents the increase in the number of cells after $$n$$ rounds of cell division, starting from a single cell, assuming each cell divides once per round?

Accepted Answer

$$N = 2^n$$

Question 15

Which of the following is an example of a polyphyletic group?

Accepted Answer

Protists

Question 16

Which of the following best describes the process by which multicellularity evolved in different lineages?

Accepted Answer

It evolved independently multiple times in different groups.

Question 17

A scientist is studying a group of organisms that have a single type of RNA polymerase with five subunits and use formylmethionine to initiate protein synthesis. To which domain do these organisms most likely belong?

Accepted Answer

Bacteria

Question 18

Which of the following is a critical step in the transition from unicellular to multicellular life?

Accepted Answer

Cells remaining attached after division and beginning to specialize

Question 19

Which of the following best explains why 'protists' are considered a polyphyletic group?

Accepted Answer

They include organisms from multiple evolutionary lineages that do not form a single clade.

Question 20

Which of the following is a real-world implication of the evolutionary relationship between Archaea and Eukaryotes for biotechnology applications?

Accepted Answer

Archaeal enzymes are used in biotechnology because their stability and similarity to eukaryotic enzymes make them useful in high-temperature reactions.

BIOL 1412: Diversity of Form & Function – Syllabus and Course Introduction

Guida di studio - Domande di pratica

Study guide - Flashcard