Carbohydrates are made exclusively from which three elements?

Why is rna synthesis not as carefully monitored for errors as is dna synthesis?

Tems11 [23]

An error in Mrna will only affect 1 molecule of RNA of the many synthesized from a gene and do not become a permanent part of the genomic information

7 0

3 years ago

Chromosomes often exchange segments of DNA during meiosis. How might this increase the survival of a species?

il63 [147K]

Answer:

Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occurs during prophase

4 0

3 years ago

The following are the steps for B-cell activation. The steps are in an incorrect order.

Nataly_w [17]

Answer:

4. B cells become activated by interacting with helper T cells.

1. B cells display antigens in MHC class II receptors on the cell surface.

2. Antibodies released by plasma cells bind to the antigen so they will be destroyed by other cells of the immune system.

3.B cells rearrange their DNA to create a unique B-cell receptor.

5. B cells undergo clonal expansion.

6. B cells digest antigens that bind to the antibodies on their surface.

Explanation:

B-cells get activated by interacting with helper T cells when they bind to the antigen to receptors i.e (MHC class II receptors on the cell surface) on the surface of the cell. Series of activities such as release by plasma cells which cause rearrangement of B cells causes the cell to divide and proliferate. The process through which daughter cells arise from a parent cell called clonal expansion.

4 0

3 years ago

Use the Harris-Benedict equation to estimate your calorie needs. Show your calculations to explain how you arrived at your answe

Ratling [72]

Answer:

The Harris Benedict Equation is a formula that determines the total daily energy expenditure (calories) using BMR with some activity factors.

Basal Metabolic Rate (BMR) is defined as the amount of calories one would burn without doing anything for 24 hours. It uses variables of weight, age, height and gender to calculate BMR.

BMR calculation = 447.593 + (9.247 x weight in kg) + (3.098 x height in cm) - (4.330 x age in years)

In Harris Benedict Equation, BMR is multiplied by activity factor to determine calories need.

The activity factors in Harris Benedict Equation are:

for no exercise = 1.2

exercise for 1 to 3 days/week or light exercise = 1.375

exercise for 3-5 days/week or moderate exercise = 1.55

exercise for 6-7 days a week or hard exercise = 1.725

exercise for 2 times training = 1.9

So, calculation for my calorie needs is as following:

BMR = 447.593 + (9.247 x 50 kg) + (3.098 x 164.592 cm) - (4.330 x 23 in years) = 974.945

Calorie needs = BMR x 1.55

= 974.945 x 1.55

= 1511.16 calories

6 0

4 years ago

Read 2 more answers

The divider between the two brain hemispheres

irina [24]

The corpus callosum connects the two hemispheres.
Hope that helped you!

5 0

3 years ago

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