A gene is a DNA sequence that codes for a protein or _____ product
a. RNA
b. DNA
c. ribosomes
d. a lipid
e. exons
ANSWER: a
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You take a break from raking your lawn to examine a leaf. While turning it over in your hands, you are struck by the way the veins in the leaf resemble a tree with many branches. You’re not sure which plant dropped this leaf, but there’s one thing you do know about it. What is that?
a. The plant’s leaves are sessile. b. The plant’s phyllotaxy is whorled. c. The plant is a dicot. d. The plant is coniferous.
In what ways are the juveniles of direct-development species like their parents, and in what way are they different?
What will be an ideal response?
Antibiotics inhibit protein synthesis
A) by disrupting cell membrane fraction B) by binding to 80S ribosomal subunits C) by interfering with the accurate reading of the mRNA message D) by binding to a 60S ribosomal subunit
One advantage of gas exchange in water is that
A) water can contain more oxygen than air. B) carbon dioxide is easier to eliminate in water than in air. C) it is easy to keep the exchange surface wet. D) ventilating gills in water requires very little energy.