When is a cell committed to undergoing mitosis?
a. once it transitions from S to G2
b. once it transitions from G1 to S
c. once it transitions from G1 to G0
d. once it transitions from G2 to prophase
Answer: b. once it transitions from G1 to S
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Pigment is contained in an eyespot or ________ that helps certain organisms orient to light.
Fill in the blank(s) with the appropriate word(s).
Magnetoreceptors ____
a. are well characterized and understood b. are known to rely on the mineral magnetite c. help many types of animals navigate long distances d. have been studied only in homing pigeons e. have been studied primarily in moths
Which one of the following structures seen here is present in both the plant and the animal cell?
1.golgi body
2.cell wall
3.chloroplasts
4.central vacuole
Researchers introduce DNA into plants by
using I. bacteria II. electric shocks III. chemical shocks
a. I only b. II only c. III only d. II and III e. I, II, and III