Reproduction in Bacteria

Q.

Step by step procedure of gram staining.

Q. Study the four statements (a - d) given below and select the two correct ones out of them
(a) Definition of biological species was given by Ernst Mayr
(b) Photoperiod does not affect reproduction in plants.
(c) Binomial nomenclature system was given by R.H. Whittaker.
(d) In unicellular organisms, reproduction is synonymous with growth.

1. b and c
2. c and d
3. a and b
4. a and d

Q.

What is transformation in biology?

Q. For transformation with recombinant DNA, the bacterial cells must first be made ‘competent’ which means

1. Increasing efficiency with which DNA enters the bacterium
2. Ability to divide fast
3. decreasing their metabolic reactions
4. increasing their metabolic reactions

Q. The theory of spontaneous generation believed that

1. life comes from the pre-existing life
2. life arises from the non-living matter
3. life came from the outer space
4. living organisms were created by God spontaneously

Q.

Bacteria commonly reproduce vegetatively by

1. Binary fission

2. Conjugation

3. Oidia

4. Budding

Q.

Is reverse central dogma found in all viruses?

Q.

Why do RNA viruses mutate faster than DNA?

Q.

What is the definition of Karyogamy in biology?

Q.

What are recognition sequences of endonucleases?

Q.

What type of reproduction do eubacteria have?

Q.

What is the purpose of sporangiophores in fungi?

Q. Study the following statements (A - D) related to the logistic growth model and select the wrong statements.

A. A population growing in a habitat with limited resources initially shows a lag phase.

B. Carrying capacity of a population is represented by ‘r’.

C. Logistic growth model is not a realistic growth model.

D. Logistic growth model is represented by a sigmoid curve.

1. A and B
2. A and C
3. B and D
4. B and C

Q.

What are hyphae?

Q.

Which one is correct about reproduction in bacteria?

1. Spores are formed under unfavorable conditions

2. Mainly by binary fission

3. Sexual reproduction by transfer of DNA from one to another

4. All of the above

Q.

Which of the following reproduces only inside a host cell?

1. Bacteria

2. Virus

3. Amoeba

4. Fungus

Q. Which of the following is not true regarding viruses?

1. They can be cultured in artificial media lacking living cells
2. They do not have a protein synthesizing machinery of their own
3. They may contain RNA as the genetic material
4. They can be crystallized and stored

Q.

Do viruses release toxins?

Q. Process by which a virus brings about genetic variation in bacteria is

1. binary fission
2. transformation
3. transduction
4. conjugation

Q. Match the columns I and II, and choose the correct combination from the options given.

$\begin{array}{cc}\text{Name of Organisms}& \text{Chromosome number in gametes}\\ \text{1) Butterfly}& \text{a) 6}\\ \text{2) Housefly}& \text{b) 39}\\ \text{3) Dog}& \text{c) 21}\\ \text{4) Cat}& \text{d) 19}\\ \text{5) Rat}& \text{e) 190}\end{array}$

1. 1 2 3 4 5
   a b c e d
2. 1 2 3 4 5
   b e d c a
3. 1 2 3 4 5
   e a c b d
4. 1 2 3 4 5
   e a b d c

Q. A technique of micropropagation is

1. Embryo rescue
   
2. Somatic embryogenesis
   
3. Protoplast fusion
   
4. Somatic hybridization
   

Q.

What is it called when a virus reproduce?

Q. Asymptote in a logistic growth curve is obtained in a population, when ____________.

1. carrying capacity is equal to number of individuals in the population
2. carrying capacity is less than the number of individuals in the population
3. carrying capacity is greater than the number of individuals in the population
4. more number of individuals are added to the population

Q. Which of the following is/are used by bacteria for their reproduction?

1. Fission
2. Spores
3. DNA transfer
4. All of the above

Q. Which statement is correct for bacterial transduction?

1. Transfer of some genes from one bacteria to another bacteria through virus
2. Transfer of some genes from one bacteria to another bacteria by conjugation
3. Bacteria obtained its DNA directly
4. Bacteria obtained DNA from other external source

Q.

The tube that is used for bacterial conjugation is known as

1. Pilus

2. Pilin

3. Conduction tube

4. Conjugation tube

Q.

Why do RNA viruses mutate faster?

Q. Every 20 minutes, one bacterium divides into two. How many bacteria will be produced after two hours, if one starts with 10 bacteria?

1. $2^5\times 10$
2. $2^6\times 10$
3. $2^5\times {10}^5$
4. $2^6\times {10}^6$

Q. A bacteria undergoes binary fission in every minute. This bacterium can fill up a cup in 1 hour. In how much time will the cup be half filled?

1. 30 minutes
2. 20 minutes
3. 40 minutes
4. 59 minutes

Q. In case of Bacillus thuringiensis, the bacterium itself is not killed by the toxic crystal protein produced by it because Bt toxin

1. cannot cause any damage to the bacterium
2. exists as the inactive toxin
3. protein is produced in very less amount in the bacterium
4. protein is not produced in the bacterium