Which of the following is true about histone acetyltransferase (HAT)?
A) HATs will make the chromatin more compacted and less available to transcription regulatory proteins.
B) HATs will remove acetyl groups from histone proteins.
C) HATs have an overall effect of increasing the positive charges on DNA.
D) HATs will add acetyl groups to DNA.
E) HATs are usually linked to increasing gene expression.
Answer: E
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An animal has a cardiac output of 40 mL/min (milliliters per minute) and a stroke volume of 5 mL. What is its heart rate?
A) 8 beats/minute B) 200 beats/minute C) 12.5 beats/minute D) Heart rate cannot be determined with only these two variables.
Which of the following is true of both T cells and B cells?
A. They produce effector cells against specific pathogens. B. They are produced from stem cells of the bone marrow. C. They can attack and destroy invading pathogens. D. They have a short life span. E. All of these statements are true.
One gram of hydrogen, which has an atomic mass of 1, would have fewer atoms than 1 gram of carbon that has an atomic mass of 12.
Answer the following statement true (T) or false (F)
The ideology that living things arise from nothing is known as: