Cells carry out three major types of work. Which of the following involves energy for cell motility and the movement of structures within cells?
A. Chemical work
B. Mechanical work
C. Transport work
D. None of the choices are correct.
Answer: B
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In mammals, Hox genes:
A. specify limbs and other structures associated with each body segment. B. direct development of structures that become parts of the hindbrain, spinal cord, and vertebral column. C. evolved by partial-genome duplication from the ancestral genes. D. are expressed in a sequence that does not reflect their linear order on the chromosome or the regions they affect. E. All of these choices are correct.
At the tip of each branch, the ____________ cover(s) the shoot apical meristem
A. bundle sheath B. leaf primordia C. flower bud D. node E. internode
Life emerged from the oceans 400 million years ago
a. True b. False Indicate whether the statement is true or false
A species is found to exist in one of three colors. Assuming an epistatic interaction, how many genes would be
involved? a. zero b. one
c. two d. three e. six