In plants, apoptosis is involved in the ________
a. loss of leaves in autumn
b. creation of water-carrying vessels
c. walling off of wounds
d. all of the choices
d
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Match the second messenger on the left with the properties on the right.
A) activates protein kinase C B) opens sensory-associated ion channels C) can bind calmodulin D) glucose mobilization E) opens calcium channels 1) cAMP 2) IP3 3) DAG 4) calcium 5) cGMP
If a pure-breeding long-tail cat (LL) is crossed with a
pure-breeding cat with no tail (rumpy, ll), and a cat with a short tail (stumpy) is produced, the simplest explanation is a. a mutation. b. an X-linked gene. c. an incompletely dominant gene. d. a lethal gene. e. chromosomal aberration.
Why are mitochondria so prevalent in skeletal muscle?
A) Mitochondria provide the muscle elasticity to contract. B) Mitochondria are primarily involved in repairing damage accumulated during exercise. C) Mitochondria provide energy for muscle contraction. D) Mitochondria produce energy anaerobically. E) More mitochondria are required in tissues where blood flow is restricted.
The integument includes all of the following except ________.
A. sweat glands B. skin C. nails D. surface capillaries E. hair