Which statement regarding stem cells is false?
A) Embryonic stem cells can give rise to all the different specialized cells in the body.
B) Adult, but not embryonic, stem cells can be grown in laboratory culture.
C) Adult stem cells are present in adult tissues.
D) Adult stem cells are partway along the road to differentiation.
Answer: B
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If ATP production was regulated by positive feedback, then high levels of ATP in muscle cells would:
A. stimulate more ATP production. B. inhibit more ATP production. C. not alter ATP production. D. stimulate ATP degradation. E. All of the answers for this question are correct.
What is the genotype of the tall plant that has red flowers and wide leaves?
In peas, tall (T) is dominant to short (t), red flowers (R) is dominant to white flowers (r), and wide leaves (W) is dominant to narrow leaves (w). A tall plant that has red flowers and wide leaves is crossed to a short plant that has white flowers and narrow leaves. The resulting progeny are shown in the table.
A) T R W / t r w
B) T R W / t r W
C) T R W / T R W
D) T R W / T r w
E) T r W / t R W
Quaking aspen can send out underground stems for asexual reproduction. Sexual reproduction is not as common, but when it does happen, the haploid gametes have 19 chromosomes. How many chromosomes are in the cells of the underground stems?
A) 9 B) 10 C) 19 D) 38
In DNA, the phosphate groups and the sugars are the outside of the double helix
a. true b. false