AnswersSnider - Biology Living Earth B Summer 2026Unit Test

Unit Test — Cumulative exam Answers

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Which is an advantage of flowering plants?

A
Flowers attract insects that transport gametes.
B
Flowers give greater access to sunlight.
C
Flowers help transport water and nutrients.
D
Flowers assist plants that live in the water.
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A scientist measured an increase in nitrous oxide in the atmosphere. This increase would result in

A
an increase in the greenhouse effect.
B
a decrease in the greenhouse effect.
C
no change in the greenhouse effect.
D
a stabilization of the greenhouse effect.
43

A biologist counts the number of zebras in a population each year, and notices an increase in the zebra population. Which describes the biologist’s actions?

A
graphing
B
inference
C
observation
D
interacting
44

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. A parakeet that is heterozygous for blue feathers (dominant) is crossed with a parakeet that is homozygous for white feathers (recessive). According to the Punnett square for this cross, what percentage of offspring is predicted to have blue feathers?

Question illustration
A
25 percent
B
50 percent
C
75 percent
D
100 percent
45

Consider the phylogenetic tree.Which pair of organisms is most closely related to primates?

Question illustration
A
amphibians and rodents
B
crocodiles and amphibians
C
rodents and rabbits
D
dinosaurs and birds
46

Which effect of long-term environmental change is the driving force behind evolution?

A
adaptation
B
extinction
C
migration
D
speciation
47

Which statement best describes how Watson and Crick's model used other scientists' work to create a model of DNA?

A
They used Chargaff's rule to determine that it contains ribose sugar.
B
They used Franklin's photo to determine that DNA was a double helix.
C
They used Levene's work to determine the number of base pairs in each strand.
D
They used Nirenberg and Matthei's studies to determine that DNA is made of nucleotides.
48

Which statement best compares transcription and translation?

A
tRNA pairs with complementary mRNA in both transcription and translation.
B
A peptide bond is created between amino acids in both transcription and translation.
C
DNA is transcribed into a complementary strand of mRNA in translation but not transcription.
D
A chain of amino acids linked by peptide bonds is formed in translation but not transcription.
49

Which most clearly shows evolutionary relationships between species?

A
binomial nomenclature
B
phylogenetic tree
C
common name
D
morphological data
50

Why is water considered to be abiotic?

A
because it is not part of the biosphere
B
because it came from something living
C
because it is dead
D
because it is not living and never lived

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