Harry Noller's experiments in which he extracted the ribosomal proteins and found that RNA molecules could catalyze
protein synthesis had one major flaw. What was the flaw?
a. the extraction process may have altered the RNA molecules
b. protein synthesis may have occurred prior to extraction
c. coenzymes, which were not extracted, might have been responsible for the reaction
d. the extraction process may have altered the pH of the environment
e. undetectable amounts of protein may have remained
ANSWER: e
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Arsenic poisoning can lead to organ failure and death. Though arsenic can inhibit or interfere with a number of cellular enzymes, arsenic poisoning is thought to be mainly due to indirect inhibition of enzymes involved in both pyruvate oxidation and the Krebs cycle. As a result, this compound must be able to enter which cellular compartment?
A. The cytoplasm B. The nucleus C. The intermembrane space of the mitochondria D. The mitochondrial matrix E. The endoplasmic reticulum Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about pyruvate oxidation and the Krebs cycle? What other information is related to the question? Choose Answer Do you have all necessary information to determine where arsenic poisoning would have its greatest impact within the cell?
Cephalization is associated with bilateral symmetry
Indicate whether the statement is true or false.
The acronym HIV stands for which of the following?
A) human intercellular virus B) human immune virus C) human immunodeficiency virus D) human immunity virus E) human immunodeficiency vector
Phagocytosis is a process by which cells do which of the following?
A.) ingest extracellular fluid and macromolecules B.) consume large particles, such as microbes and cell debris C.) engage in receptor mediated endocytosis D.) secrete hormones and neurotransmitters E.) digest their own worn out organelles