In what structure is the sperm of a flowering plant contained?
A) stigma
B) carpel
C) pollen
D) spore
C
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Proteins and RNA molecules that are needed in the cell, at about the same level under all growth conditions, require constitutive expression
Indicate whether the statement is true or false.
When two genes on the same chromosome are located 10 map units from each other, ____ of the offspring from a
testcross for genetic linkage should have a recombinant phenotype
a. over 75% b. about 50% c. about 25% d. about 10% e. about 5%
Which cells serve as electrical insulators in the central nervous system?
a. Schwann cells b. oligodendrocytes c. astrocytes d. efferent neurons e. afferent neurons
The lancelet looks like a fish but is considered an invertebrate because it:
a. lacks lungs. b. lacks a nerve cord. c. lacks a backbone. d. both b and c