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EXAM 4 BIOS 100
Terms in this set (40)
Where does meiosis occur in a fern?
I am looking at a small, white flower. What is the most likely pollinator of this plant?
The pine cones that you are all familiar with contains what plant reproductive structures?
Which group of plants we studied and listed below contains all the seed plants?
Angiosperms + conifers
Which group of plants we studied and listed below contains all the vascular plants?
Angiosperms + conifers + ferns
A seed is a ripened (matured):
What part of a carpel is the receptive site for pollen?
Which group of plants we studied and listed below contains the plants that have the gametophytes as the dominant stage in the life cycle?
The basic functional unit of the kidney is
What is the driving force for the filtration of blood by the renal corpuscle?
Higher pressure in glomerular capillaries than in the surrounding Bowman's capsule
In which region of the nephron is a steep osmotic gradient created?
loop of Henle
A sea-going shark is placed in a water tank where goldfish are normally kept. What is likely to happen?
large amounts of water will enter the fish
The apical membrane of an epithelial cell from the shark rectal gland normally contains
If a red blood cell is placed in a salt solution and bursts, what is the tonicity of the solution relative to the interior of the cell?
Secretin is a hormone that aids in digestion by inducing the ______________ to secrete ____________________.
Lipoproteins are responsible for
movement of fat molecules between different compartments in the body
In mammals dietary fat is carried to targets such as adipose tissue via particles called
fruit flies are often seen flying around fruit bowls, but what they are really after is
yeast growing on fruit
Drosophila and rabbit stomach acid secreting cells share which feature:
they both have apical proton pumps that acidify the stomach lumen
Our adipocytes store fat
in a single large lipid droplet that occupies most of the cell's volume
Stomach acid secretion in Drosophila appears to be non-essential because
fly mutants that fail to make copper cells are otherwise healthy
Stomach acid secretion in humans appears to be non-essential because
our stomach acid secretion can be blocked indefinitely by taking omeprazole
C. flies don't care if we make stomach acid or not
Insects have no need for blood vessels, and therefore
they also have no need for a digestive tract
have no way to move fat between tissues in their bodies
have no need for a heart
all of these are incorrect
Some fish have no gills when very young, but then develop gills that grow larger and
larger as the fish grows larger. What is the driving force for this change during development?
As fish grow and their body volumes increase dramatically there is a higher and higher demand for surface area to mediate gas exchange
Air rushes into the lungs of humans during inhalation because _____.
the rib muscles and diaphragm contract, increasing the lung volume
How does fetal hemoglobin in humans differ from adult hemoglobin?
it has a higher affinity for oxygen
Oxygen will diffuse from blood to tissue faster in response to which of the following conditions?
a decrease in the partial pressure of oxygen (PO2) in the tissues
The anion exchanger of human erythrocytes moves bicarbonate anion in and out of red blood cells according to where the bicarbonate anion is most concentrated. When a red blood cell returns to the lungs after a trip to tissues deep in the body, which direction will the exchanger be working in?
moving out of plasma into red blood cells
Fish maximize the efficiency of gill function (degree of O2 recovery from water and O2 capture by red blood cells) by pairing the water flow over gills to the circulation
in a countercurrent flow (opposite directions)
it is thought that the S-shape of the blood oxygen-hemoglobin equilibrium curve is important in
insuring that a significant amount of oxygen falls off the hemoglobin during high intensity exercise
Accumulating CO2 from our tissues indirectly leads to a slight acidification of the blood, which is taken as a cue by the brain to ...
breathe deeper and more rapidly
During the course of muscle contraction the potential energy available in ATP is transferred to potential energy stored in
the myosin head
The release of _______________ ions from the sarcoplasmic reticulum is required to initiate skeletal muscle contraction
The sarcoplasmic reticulum is another name for ________________________ in muscle cells
the endoplasmic reticulum
Myosin heads bind to ________________________ which they then pull and cause to slide towards the center of the sarcomere
nce a neuron stops sending its signal for a muscle cell to contract, the first thing that has to happen for the muscle to stop contracting is
an ion pump in the sarcoplasmic reticulum restores the resting ionic conditions in the sarcoplasm
Muscle contraction is the result of shortening of
space between Z lines
The mechanochemical cycle of muscle myosin differs from kinesins' in that
myosin has only a brief, transient interaction with actin thin filaments
A familiar example of a muscle that has voluntary activity is
the quadriceps in your thigh that you use when running
Which of these is not an example of striated muscle
the muscle in your bronchioles that regulates air flow to alveoli
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