A growth pattern where a low-density population grows slowly, goes through a rapid growth phase
and then levels off when the carrying capacity is reached is called
a. logistic growth.
b. exponential growth.
c. linear growth.
d. ascending growth.
e. capacity growth.
A
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What distinguishes expression vectors from other cloning vectors?
a. Expression vectors do not have an origin of replication. b. Only expression vectors have origins of replication. c. Expression vectors contain regulatory sequences to allow transcription and translation of an inserted gene. d. Inserted genes cannot be transcribed from an expression vector. e. Expression vectors do not contain antibiotic resistance genes.
A new mRNA can pass through the pores of the nuclear membrane into the cytoplasm only if ________
a. it has been phosphorylated b. it has been processed c. motor proteins attach to a base sequence and link the molecule to cytoskeletal elements d. proteins attach to a base sequence near the poly-A tail and temporarily block translation
Which group of molecules is involved in stopping the cell cycle?
a. positive regulators b. monitory regulators c. negative regulators d. cessation regulators
The urine-producing unit of the kidney is the ____
a. renal artery b. renal vein c. urethra d. nephron e. ureter