BIO EXAM 3
One pound of human mass is approximately 3500 calories. If a 200-lb person consumes 2000 calories a day, and expends 2500 calories a day, what would the person weigh after 21 days?
197 lbs
How many molecules of pyruvic acid (3-carbon) are made from a single molecule of glucose (6 carbon)?
2
If a cell that is alive is placed in an air-tight chamber and given enough energy in the form of glucose, you would correctly predict that after a few hours, the concentration of _______________ will decrease, while the concentration of _________________ will increase inside the chamber.
oxygen, carbon dioxide
Which of the following organisms will be the most abundant in most communities?
primary producers
Which of these is a major concern about the overuse of antibiotics?
It can lead to antibiotic-resistant bacteria
After having a disease, why is an individual more resistant to it?
Memory cells (b-cells that are retained) are present in the body.
A population of snails has 100 individuals. During one month, 60 new snails are born and 40 die. Calculate the following parameters: b = d = r = G = N2 =
N= 100 b= 60/100 = .6 d= 40/100 = .4 r=.6 - .4 = 0.2 G= (0.2) (100) = 20 N2= 120
Which of the following is not a greenhouse gas?
Oxygen
The tendency of heat and chemicals is to flow from an area of _________ concentration to an area of ________ concentration.
high ; low
On average, what percentage of energy is passed on to a consumer in the next trophic level?
10%
Assuming that detached earlobes are dominant over attached earlobes, calculate the probability that a woman with detached earlobes (with the genotype EE) and a man with attached earlobes (with the genotype ee) have a child with detached earlobes.
100% detached earlobes
If the human serum albumin protein is a single polypeptide of 585 amino acids, how many nucleotides code for it?
1755
How many atoms are in a molecule of water?
3 atoms
How many chromosomes do your skin cells have?
46
If there were 80 chicken growing at a rate of 0.5, and the barn has a 100 chicken carrying capacity, what would be the population size at the end of two weeks?
88
Which of the following conditions is unlikely to undergo evolutionary change:
A population with no genetic variation for a given trait
Cells can be largely classified as prokaryotic or eukaryotic. What is one major diagnostic feature?
One does not have organelles
Convert this DNA sequence into an amino acid sequence: AGC GTA ACG TAC
Serine Histidine Threonine Tyrosine
Many diseases have an incubation period. Which of the following best describes what an incubation period is?
The period during which someone has an infection, but is not showing symptoms
If a (living) person is placed in an air-tight chamber, you would correctly predict that after a few hours, the concentration of _______________ will increase, while the concentration of _________________ will decrease inside the chamber.
carbon dioxide; oxygen
All cells have:
cell membrane
Enzymes are important because they ______________ the activation energy required to start a reaction.
decrease
Cancer cells...
divide without appropriate external signals
The lion with the greatest fitness is:
sandy
What determines if one atom will react with another atom?
the number of electrons in its outer most shell
Why are organ transplants sometime rejected?
B-cells respond to antigens present on the organ
A scientist is conducting a study to determine how well a new medication treats ear infections. The scientist tells the participants to put 10 drops in their infected ear each day. After two weeks, all participants' ear infections had healed. Which of the following changes to the design of this study would most improve the ability to test if the new medication effectively treats ear infections?
Create a second group of participants with ear infections who do not use any ear drops
How many chromosomes do your sex cells (egg or sperm) have?
23
