Peptides and small proteins are generally too large to be transported into cells using transport proteins or by moving through pores. The macromolecules are brought into the cell using
A) diffusion.
B) exocytosis.
C) gated channels.
D) endocytosis.
E) open channels.
D
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About half of all flowering plant species, including many important crop plants, are ____
a. polyploids b. haploids c. aneuploids d. euploids e. diploids
In order for homeostasis to be maintained a(n) ________ must detect a specific stimulus
a. affector b. sensory receptor c. gland d. sensory affector e. effector
Pili may do all of the following EXCEPT
a. help cells attach to surfaces. b. function in reproduction. c. extend from the cell surface. d. be transferred between cells. e. function in cell locomotion
Which of the following best describes a cloning vector?
A) A DNA molecule that accepts DNA fragments and degrades them in a host. B) A DNA molecule that accepts DNA fragments and replicates the fragment in a host. C) The fragment of DNA encoding a gene of interest. D) The direction in which DNA is cloned.