AnswersTPS EdX BiologySimple and Complex Organisms

Practice Test Answers

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1
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Which label belongs in the area marked cap x ?

A
Are eukaryotic
B
Have an outer skeleton
C
Are heterotrophs
D
Have a backbone
2
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Old classification systems based on physical characteristics would most likely disagree with the relationship between which two animals in the tree?

A
bats and humans
B
crocodiles and insects
C
birds and bats
D
humans and crocodiles
3

What do sclerenchyma and collenchyma have in common?

A
They both function for food production and storage.
B
They are both thin-walled.
C
They both function for support.
D
They are both dead cells.
4

Which kingdom(s) include both unicellular and multicellular organisms?

A
Plantae and Archaebacteria
B
Animalia and Plantae
C
Fungi
D
Eubacteria
5

There are four steps in bacterial conjugation. The second step is missing in this list. 1. Special sex pilus connects two cells. 2. 3. Each cell makes a complementary DNA strand. 4. The cells separate. Which is the missing step for the process of conjugation described?

A
The cell membrane elongates and pinches off.
B
A DNA molecule attaches to the cell membrane.
C
Some DNA moves from one cell to another.
D
Two new, identical cells are produced.
6

Consider the terms egg , sperm , and sporophyte . Which term links egg and sperm directly to sporophyte?

A
fertilization
B
meiosis
C
gametophyte
D
spore
7

Which statement best describes the difference between xylem and phloem?

A
Xylem cells are thin-walled and tubular, and phloem cells are thick walled and strengthened by lignin.
B
Xylem tissue is found at the growing parts of plants, and phloem is found on the outer part of plants.
C
Xylem transports water and nutrients in the plant, and phloem transports water and sugar.
D
Xylem cells make up vascular tissue, and phloem cells make up ground and dermal tissue.
8

The haploid number of sphagnum moss is 19 What is its diploid number?

A
9 point 5
B
19
C
38
D
76
9

Ceratium fusus is a protist that is found primarily in coastal waters, especially around the coast of the United Kingdom. These organisms are unique because they can undergo a special chemical reaction at night that helps defend them against predators. It provides defense by attracting larger predators that prey on the organisms that eat Ceratium fusus . Which characteristic of Ceratium fusus is being described?

A
chitin cell walls
B
glass-like cell walls
C
bioluminescence
D
photosynthesis
10

Beans, peaches, and tomatoes are all in the same group of plants. What do these plants have in common?

A
Their seeds are not protected by fruit.
B
They do not have vascular tissue.
C
They bear flowers and seeds.
D
Their seeds do not have cotyledons.
11

Which level of classification contains orders but is smaller than phylum?

A
family
B
species
C
class
D
kingdom
12

Which two characteristics do all animals have?

A
They have a backbone, and their cells have membrane-bound organelles.
B
They are symmetrical and heterotrophic.
C
Their cells have a nucleus and membrane-bound organelles.
D
They are heterotrophs and have a backbone.
13

Which example best demonstrates the importance of having knowledge of evolutionary relationships?

A
organ transplantation between species
B
blood donation from a human to a human
C
DNA sequence of an insect
D
illustration of a plant leaf
14

Which best explains why angiosperms are the most diverse and successful plant group today?

A
Water transport and photosynthesis are aided by vascular tissue.
B
Reproduction is aided by exposed seeds and wind pollination.
C
Reproduction is aided by flowers, protected seeds, and insect pollinators.
D
Plant growth and increasing size are aided by a new way to distribute nutrients.
15

Which best describes the different modes of bacterial reproduction?

A
In transduction, a bacterium exchanges a piece of its own DNA with another from the environment.
B
In conjugation, a special sex pilus is required to connect two bacterial cells.
C
In transformation, bacterial DNA is transferred from one bacterium to another by a replicating virus.
D
In genetic recombination, two new genetically identical cells are produced.
16

Which question is most likely to be found in a dichotomous key for identifying a tree by its leaves?

A
What is the shape of the tree’s leaves?
B
Are the leaves shaped in a way that slows the evaporation of water?
C
Are the leaf bases attached opposite to each other on the branch?
D
What type of birds prefer nesting in the tree?
17

A scientist has correctly gone through all the possible steps in a dichotomous key, but has not identified an insect. Which most likely describes why he did not identify the insect?

A
The insect might be an unknown variation or a new species.
B
The organism evolved during identification.
C
The dichotomous key had too many questions.
D
The scientist must have made a mistake.
18

Which of the statements are true?

A
II and III
B
II and IV
C
III and IV
D
I and IV

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