Which of the following best describes the innate immunity?
A. It is a response to a specific pathogen.
B. It is the basis for the use of vaccines.
C. It reacts to a wide variety of pathogens.
D. It is a response to a specific pathogen
AND is the basis for the use of vaccines.
C
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What is the correct chromosomal condition at prometaphase of mitosis?
A) A B) B C) C D) D E) E
In some regions, butterflies are emerging earlier than the flowering of herbaceous plants. This is an issue because
A) butterflies rely on the flowers for food. B) butterflies rely on the flowers for shelter. C) butterflies rely on the flowers to deposit eggs. D) herbaceous plants rely on butterflies for food.
Which sturcture makes proteins using coded instructions that come from the nucleus?
A. Golgi Apparatus B. mitochondrion C. vacuole D. ribosome
How do changes in histone modifications lead to changes in chromatin structure?
(a) They directly lead to changes in the positions of the core histones. (b) They change the affinity between the histone octamer and the DNA. (c) They help recruit other proteins to the chromatin. (d) They cause the histone N-terminal tails to become hyperextended.