Which is a heart?
a) the structure that is the location for gas exchange
b) the muscle that pumps blood through the circulatory system
c) the organ that controls all of the other organs in the body
d) the organ that breaks down food molecules to obtain energy
Ans: b) the muscle that pumps blood through the circulatory system
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Eukaryotic cells manufacture cytoskeletal proteins, which help to maintain cell shapes and functions. What would you predict about these proteins?
A) They initially contain signal sequences that allow their entrance into the endoplasmic reticulum. B) They are manufactured on free ribosomes in the cytoplasm. C) They are glycosylated in the Golgi apparatus. D) They travel to the nucleus in a transport vesicle with a specific signal.
Which of the following is a statement of the first law of thermodynamics?
A) Energy cannot be created or destroyed. B) The entropy of the universe is decreasing. C) The entropy of the universe is constant. D) Kinetic energy is stored energy that results from the specific arrangement of matter. E) Energy cannot be transferred or transformed.
Which of the following is not part of the P1 lytic cycle?
A. The DNAs are cut from the linear product of rolling circle replication, circularized, and then packaged into phage heads. B. When P1 DNA enters the cell, it circularizes its genomes using the Cre-lox recombination system. C. Rolling circle replication occurs, generating many copies of the phage genome as a long linear DNA. D. The cells lyse and the mature phages can infect other cells. E. All of the choices given are part of the lytic cycle.
Which of the following numbered events represents the correct sequence of events of prokaryotic
translation initiation? 1) large ribosomal subunit binds to initiation complex 2) initiation tRNA binds small ribosomal subunit 3) initiation complex binds to ribosome recognition sequence on mRNA a. 1 ? 2 ? 3 b. 1 ? 3 ? 2 c. 2 ? 1 ? 3 d. 2 ? 3 ? 1 e. 3 ? 2 ? 1