Protein kinases help phosphorylate target proteins, but they are present in relatively constant concentrations throughout the cell cycle

Which proteins, which vary during the cell cycle, form a complex with the kinases to activate them only at specific times?


cyclins

Biology & Microbiology

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Every protein is assembled on a(n) ____ according to instructions copied from ____, using ____ as an intermediate

a. mRNA; tRNA; DNA b. tRNA; mRNA; DNA c. ribosome; mRNA; tRNA d. tRNA; DNA; mRNA e. ribosome; DNA; mRNA

Biology & Microbiology

Robert has a tumor on his brain that requires radiation. Before his treatment, doctors perform a CT scan so they can know where to target the beam of radiation. Robert's head is shaved in that area and he receives a tiny circle tattoo to allow the radiation technicians to pinpoint the beam of radiation. What type of therapy is Robert receiving?

A. low-dose internal radiation therapy B. external radiation therapy C. high-dose internal radiation therapy D. interstitial brachytherapy E. chemotherapy

Biology & Microbiology

Imagine that a population of deer living on an island without any predators was threatened with overpopulation, until wolves were imported

After a couple of years, there were fewer deer, but their average running speed and the length of their legs had increased. What process accounts for the change? A) Natural selection B) Changes due to chance alone C) Inheritance of acquired characteristics D) Genetic impossibility E) Unfavorable mutations

Biology & Microbiology

The body wall of an earthworm contains layers of ____ and ______ muscle tissue

What will be an ideal response?

Biology & Microbiology