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Q1. A subject extends his arm palm up to catch a falling object. The contact of object with the hand triggers a reflexive response in the biceps muscle. But this response is different and opposite if the object is a raw egg instead of a ball. Explain why with reason?
Q2. Many physiological changes occur during exercise.
a. plan a controlled experiment to test the hypothesis that an exercise session causes short-term increases in heart rate and breathing rate in human.
b. Explain how at least three organ systems are affected by this increased physical activity and examine interactions among these systems.
Explain what occurs during the Krebs (citric acid) cycle and electron transport by describing the following.
Determine the proportion of the various phenotypes (blood type and ability to secrete) in matings between individuals who are blood type AB and type O, both of whom are Se/se.
It is determined that the human immune system synthesizes 10 8 – 10 10 antibodies. The portion of a typical active in binding antigen consists of two variable domains each containing one hundred amino acids.
Suppose when a virus goes out of lysogeny to finish the lytic pathway, it loops up. DRAW this looping just prior to recombining out of the chromosome.
Draw a bidirectional replication fork and label the origin of replication, the leading strands, lagging strands, and the 5' and 3' ends of all strands shown in your diagram.
List the dining characteristics of Kingdom Monera. What is the common name for the largest group of Monerans? What group of Monerans are an important source of O2?
define a genetic cross between two sufferers
What is the probability that, in an organism with a haploid number of 15, a sperm will be formed that contains all 15 chromosomes whose centromeres were derived from maternal homologs?
What is the critical distance a cell must maintain from a capillary in order to survive? Explain the role diffusion plays in the process.
Which of these are not properties of the stretch reflex? a) It regulates muscle length. b) It is a disynaptic reflex. c) It is activated by muscle elongation. d) Its receptor is muscle spindle.
A normal subject is breathing room air and expiring into a large collection bag. When the expired air is analyzed, the mean expired PECO2 is measured at 30 mm Hg.
On a given microscope, the numerical apertures of the condenser and low power objective lenses are 1.25 and 0.25, respectively. You are supplied with a filter that selects a wavelength of 250nm.
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