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- Question
What holds the sides of the DNA ladder together?
Options- A. Polar covalent bonds
- B. Ionic bonds
- C. Metallic bonds
- D. Covalent bonds
- Correct Answer
- Covalent bonds
ExplanationDeoxyribose, which is a pentose, and a phosphate group are the two molecules together form the two sides of the DNA i.e, A sugar (deoxyribose) and a phosphate.
DNA is a double-stranded molecule twisted into a helix (think of a spiral staircase). Each spiraling strand, comprised of a sugar-phosphate backbone and attached bases, is connected to a complementary strand by non-covalent hydrogen bonding between paired bases. The bases are adenine (A), thymine (T), cytosine (C) and guanine (G). A and T are connected by two hydrogen bonds. G and C are connected by three hydrogen bonds.
- 1. Which of the following is not an Endocrine Gland?
Options- A. Spleen
- B. Pituitary
- C. Thyroid
- D. Adrenal Discuss
- 2. In which of the following kind of organisms is the phenomenon found where in the female kills the male after copulation __________
Options- A. Drgonfly
- B. Honey bee
- C. Spider
- D. Pit viper Discuss
- 3. Food wrapped in news paper is likely to get contaminated by
Options- A. Magnesium
- B. Alluminium
- C. Lead
- D. Copper Discuss
- 4. The rate of heartbeat is accelerated by the harmone
Options- A. adrenaline
- B. acetylcholine
- C. thyroxine
- D. pituitrin Discuss
- 5. The biogenetic law was proposed by
Options- A. Alfred Russel Wallace
- B. Charles Darwin
- C. Ernst von Haeckel
- D. Lamarck Discuss
- 6. Which of the following statements best describes nutrient density?
Options- A. Consume a variety of foods from MyPyramid's ±ve major food groups every day.
- B. Consume foods that have the most nutrition for their kcalories
- C. Choose a number of diFerent foods within any given food group rather than the same old thing.
- D. All the above Discuss
- 7. Select the correct statement about the Heart Valves.
Options- A. Aortic and pulmonary valves control the flow of blood into the heart.
- B. The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.
- C. The tricuspid valve divides the left atrium from the left ventricle.
- D. The mitral valve separates the right atrium from the right ventricle. Discuss
- 8. Which of the following is an abnormal constituent of urine?
Options- A. Creatinine
- B. Uric acid
- C. Glucose
- D. Urea Discuss
- 9. Sort each description by the type of RNA it describes? a) contains an anticodon b) specifies the amino acid squence for a protein c) contains exons d) has amino acids covalently attached e) is a component of ribosomes f) is the most abundant form of RNA
Options- A. a, b, d - tRNA, c - mRNA, e, f - rRNA
- B. a, c - tRNA, b, d - mRNA, e, f - rRNA
- C. a, e, f - rRNA, b - mRNA, c, d - tRNA
- D. None of the above Discuss
- 10. The normal blood pressure in human beings is
Options- A. 80/120
- B. 120/80
- C. 80/110
- D. 110/90 Discuss
Biology problems
Search Results
Correct Answer: Spleen
Explanation:
Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct.
The major glands of the endocrine system include the
pineal gland,
pituitary gland,
pancreas,
ovaries,
testes,
thyroid gland,
parathyroid gland,
hypothalamus and
adrenal glands.
Correct Answer: Spider
Correct Answer: Lead
Explanation:
It gets contaminated by lead
Correct Answer: adrenaline
Explanation:
The hormone adrenaline also called epinephrine is known as a stress harmone. In emotional upset (like fear, anger etc.) this harmone is poured into the blood and it accelerates heart beat. The hormone acetylcholine decelerates heartbeat rate.
Correct Answer: Ernst von Haeckel
Explanation:
The biogenetic law states that ontogeny (study of development) repeats phylogeny (origin from previous group of racial history), The young one of the frog namely the tadpole is like a fish cosidered to be ancestral to frog.
Correct Answer: Consume foods that have the most nutrition for their kcalories
Explanation:
Consume foods that have the most nutrition for their kcalories describes the Nutrient Density.
Correct Answer: The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.
Explanation:
The correct statement from the given options is
The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.
Correct Answer: Glucose
Explanation:
Normally, urine contains water and wastes, such as urea, uric acid, creatinine, and some ions. However, some of these substances may be abnormally elevated, which usually indicates that something is wrong with the body.
The following are some of the abnormal constituents of urine::
Albumin
Bilirubin
Glucose
Ketone bodies
Blood
Microbes
White blood cells
Correct Answer: a, b, d - tRNA, c - mRNA, e, f - rRNA
Explanation:
Option A)
a, b, d - tRNA, c - mRNA, e, f - rRNA
Is the given sorted description that describes the RNA type.
Correct Answer: 120/80
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