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NTR 401 Quizzes 7-10 Questions with Correct Answers
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NTR 401 Quizzes 7-10 Questions with Correct Answers
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NTR 401 Quizzes 7-10 Questions withCorrect Answers
The enzyme that converts thyroxin to T3 in the brain is called iodothyronine deoidinase,
type 2. Deiodinase type 1, that occurs in muscle and other peripheral tissues contains a
covalent form of the trace element - Answer-Selenium
What is usually the richest source of NATURALLY occurring iodide for the diet? -
Answer-Seaweed
The trace mineral most closely associated with growth depression if intake is marginally
deficient, and more extreme stunting and delayed sexual maturation if intake is more
severely deficient, is - Answer-Zinc
Symptoms of an iodide deficiency or hypothyroidism in utero are LEAST likely to include
- Answer-Severe Acne
Deficiency of folate around the time of conception leads to ALL of the following birth
defects EXCEPT - Answer-Cretinism
The substance that causes birth defects when used as a component of a drug that is
used for treatment of acne is - Answer-Retinoic Acid
RXR is the designation used for a cytoplasmic protein that has the capability to enter
the nucleus of the cell through the "importin" channel after interacting with ALL of the
following nutrients or hormones EXCEPT - Answer-Vitamin K and its receptor
Where are the receptors for thyroid hormone (T3) found? - Answer-In the cytoplasm and
nucleus of nearly all cells in the body
Where are the receptors for thyrotropin releasing factor (hormone) (TRF) found? -
Answer-In the anterior pituitary
Where are the receptors for thyroid stimulating hormone (TSH) found? - Answer-On the
plasma membrane of the thyroid gland
Zinc finger proteins are best described as - Answer-Transcription factor binding proteins
that interact with DNA using peptide loops structurally stabilized by coordinating zinc
ions
The clinical symptoms of a deficiency of vitamin A, such as immune depression, growth
retardation, and anorexia, sometimes resemble the clinical symptoms of a deficiency of
zinc. One possible reason for this might be - Answer-The alcohol dehydrogenase that
converts retinol to retinal (reversibly) is a zinc-dependent enzyme
, The Adequate Macronutrient Distribution Range (AMDR) for carbohydrates, based on
an apparent healthy intake of fat, protein and carbohydrate, is - Answer-45-65% of kcal
intake
The RDA for carbohydrate is based upon - Answer-The glucose uptake by the brain so
that gluconeogenesis from body protein can be prevented
Why are two enzymes needed in the beginning stages of gluconeogenesis to convert
pyruvate back to phosphoenolpyruvate? - Answer-2 enzymes are needed because PEP
is a highly energized compound and it is too big of a leap in energy for 1 enzyme
reaction to activate without more intermediate compounds
Most cell membranes use a type of glucose transporter called GLUT(1-12) for facilitated
uptake to get glucose into the cell for catabolic or anabolic pathways. A different type of
transporter is used in which cell type? - Answer-Small intestine enterocytes (Brush
border)
Muscle and adipose cells increase the number of GLUT4 transporters in their plasma
membranes when they are stimulated by - Answer-Insulin
All of the following hormones can increase or decrease the rate of glycolysis EXCEPT -
Answer-cholecalfiferol
The rate of glycolysis in most cells is regulated by an increase in the activity of ALL of
the following enzymes EXCEPT - Answer-acetyl-CoA carboxylase
Generation of 5-carbon sugar phosphates is dependent on which pathway? - Answer-
Pentose phosphate pathway
How many enzymes are needed for the multistep conversion of pyruvate to acetyl CoA?
- Answer-5
Which of the following is NOT an outcome of the citric acid cycle? - Answer-synthesis of
fatty acids
This enzyme releases fatty acids from the triglyceride in a chylomicron - Answer-
lipoprotein lipase
The enzyme that converts essential fatty acids to prostaglandins and eicosanoids -
Answer-cyclooxigenase (COX)
In some cell signaling pathways, this enzyme releases phosphoinositol (PIP) from
phospholipids - Answer-phospholipase C
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