Which of the following carries amino acids to
ribosomes?
. mRNA
b. tRNA
c. hnRNA
d. rRNA
e. all of these
B
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Which situation describes potential observer bias in an experimental process?
A) Dr. Jones is evaluating cancer patients for their responses to a new therapeutic drug. She knows which patients are receiving the placebo and which are receiving the drug. B) Mr. Bromley is conducting a survey of weight loss for his professor. He asks each student in the study the same questions. C) Ms. Bradley is an outside consultant who is conducting a health and wellness survey for a pharmaceutical company. She does not know the name of the company nor does she know the name of the drug being tested during the survey. D) Dr. Postgate is analyzing biopsy samples from rats that have been given either a placebo or an experimental drug believed to reduce inflammation. Each sample is identified by a code number so that Dr. Postgate cannot tell which treatment the rats received.
Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones. Requirements for facilitated diffusion include
A. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always against the concentration gradient, never with the gradient. B. The carrier molecule must be specific to the molecule that is transported and an ATP molecule must be attached to the specific carrier. The direction of movement is always against the concentration gradient, never with the gradient. C. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient. D. The carrier molecule must be specific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient.
An experiment mixed together oil (lipids), organophosphate-containing detergent in water, and copper ions to act as a catalyst for a chemical reaction. Membranes budded off of the oil in this mixture. Which of the following is a reasonable and possible explanation of the experimental results?
a. The chemical reaction caused the organophosphates from the detergent to chemically combine with lipids from the oil to form phospholipids. The hydrophilic tails lined up towards each other with their hydrophobic heads pointing out towards the water; this configuration formed a phospholipid bilayer that pulled into a liposome. b. The chemical reaction caused the organophosphates from the detergent to chemically combine with lipids from the oil to form phospholipids with hydrophilic heads and hydrophobic tails. The hydrophobic tails lined up towards each other with their hydrophilic heads pointing out towards the water; this configuration formed a phospholipid bilayer that pulled into a spherical liposome. c. The copper ions permanently, chemically combined with the lipids to form phospholipids. The hydrophilic tails lined up towards each other with their hydrophobic heads pointing out towards the water; this configuration formed a phospholipid bilayer that pulled into a liposome. d. The copper ions permanently, chemically combined with the lipids and phosphates to form phospholipids. The hydrophilic tails lined up towards each other with their hydrophobic heads pointing out towards the water; this configuration formed a phospholipid bilayer that pulled into a liposome.
Turtle hatchling survivorship rate is low in many turtle species due to predation. Amanda researched the predatory rate on a species of turtle eggs in the Red River. The eggs were harvested from trapped turtles and the egg's cloaca film (reproductive discharge) was either washed off or left on once gathered. Research suggests that predators use the female's cloaca scent to locate the eggs.The eggs were only handled when wearing gloves and then reburied along islands where the turtles were trapped. The nests were monitored by cameras and manually on foot and data on nest predation were recorded.Based on the experimental design, what is the control?
A. Hatchling survival rate B. Cloaca scent on eggs C. Time eggs spent in ground D. No cloaca scent on eggs