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Factors impacting digestion and absorption of iron include all of the following but: - Individual's iron status - The amount of stomach acid present to digest the foods - The presence of alcohol - The type of iron present in the foods consumed The majority of dietary zinc is absorbed as long as the gastrointestinal pH is maintained. - True - False How does excessive vitamin A intake affect the immune system? - Inhibits enzyme synthesis - Suppresses immune response - Has no effect on the immune system - Enhances immune response Poor iron status improves gastrointestinal absorption of iron. - True - False
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When the process of Lac operon is blocked by a repressor it represents :Hard
(A) Positive regulation
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(C) sometimes positive sometimes negative
(D) both positive and negative regulation
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This plant consists of only two leaves and a stem with roots. Its two leaves continuously grow to a length of 2 - 4 metres and usually become split into several strap - shaped sections. It is a very long-living plant, living between 400 and 1500 years. Identify this plant.Medium
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TASK:
Choose one example natural selection to investigate. Some examples observed cases of natural selection include (but are not limited to):
An insect population's response to pesticides 'e.g., mosquito and DDT}
Research your specific example of natural selection to better understand how and why the population has changed over time. Organize your information into the presentation format below_ Step by step explanation of how population can change over time, Using your example Description of inherited variation within the population Explanation of why some individuals are better able to survive and produce offspring A description of the adaptation that is being favored by natural selection Data to support explanations
Question 2
Which of the following about pulsatile flow is true?
- It is characteristic of the smallest blood vessels.
- The highest velocity occurs at the walls of the vessel.
- It has a parabolic profile.
- There are changes in direction.
- There are changes in velocity.
Question 3
Match each of the following physiological changes with the
correct division of the autonomic system.
- A.
B.
Dilation of pupil
- A.
B.
Decrease in heart rate
- A.
B.
Constriction of internal urinary sphincter
- A.
B.
Producing sweat
- A.
B.
Constriction of pupil
- A.
B.
Erection
- A.
B.
Constriction of blood vessels
- A.
B.
Contraction of digestive muscles
- A.
B.
Secretion of saliva
- A.
B.
Increase in heart rate
- A.
B.
Dilation of bronchi
- A.
B.
Contraction of detrusor muscle of bladder
A.
Parasympathetic
B.
SympatheticQuestion 4
Text: PROBLEM 04
In a population with two alleles, B and h, the allele frequency of B is 0.2. If B is dominant, what is the frequency of individuals with the dominant phenotype if the population is in Hardy-Weinberg equilibrium? Show your work: √(p^2 + 2pq + q^2) = √(0.2^2 + 2(0.2)(0.8) + 0.8^2) = 0.48.
| Question Text | Factors impacting digestion and absorption of iron include all of the following but:
- Individual's iron status
- The amount of stomach acid present to digest the foods
- The presence of alcohol
- The type of iron present in the foods consumed
The majority of dietary zinc is absorbed as long as the gastrointestinal pH is maintained.
- True
- False
How does excessive vitamin A intake affect the immune system?
- Inhibits enzyme synthesis
- Suppresses immune response
- Has no effect on the immune system
- Enhances immune response
Poor iron status improves gastrointestinal absorption of iron.
- True
- False |
| Topic | All topics |
| Subject | Biology |
| Class | Class 12 |
