1. a unicellular organism with no nucleus is a 2. the type of infection in which a virus does not immediately start replicating itself, but inserts a piece of dna into the host cell’s genome which becomes activated at a later date is called a
3. a spiral or corkscrew-shaped prokaryote is called
4. the thick internal wall that can enclose a prokaryote’s dna and some cytoplasm when conditions are unfavorable is called a

1. The right answer is Prokaryotes.

In biology and taxonomy, a prokaryotic organism is a prokaryotic cell, a unicellular organism lacking nucleus and organelles whose unique DNA molecule forms a circle or a helix. It is a cellular microorganism in which the chromosomes are not enclosed in a nucleus; for example a bacterium. The exception is ribosomes.

2. The right answer is Lysogenic infection (Virus latency or persistence).

Viral latency is a period in which complete copies of viral genetic information persist in an infected host cell, but there is no continuous production of infectious virus particles.

The genetic material of the virus at this stage is embedded in the genome of the host cell in the form of DNA sequences. During the latency, the whole genome of the virus is in the cell, and its expression is very limited.

it is denoted as the lysogenic part of the life cycle of the virus (like HIV and Herpes).

3. The right answer is Spiral bacteria

Some bacteria are helical. They are Spirillas if the form is invariable and rigid, Spirochaetes if the body is flexible and can change shape. The great diversity of forms is determined by the cell wall and the cytoskeleton. The different forms of bacteria can influence their ability to acquire nutrients, attach to surfaces, swim in a liquid and escape predation.

4. The right answer is Endospore

The endospore (or spore) is a structure that forms within the cytoplasm of certain species of bacteria when the environmental conditions are unfavorable (nutritive stress, desiccation, heat ...).

The spore contains especially nucleic acids (DNA and RNA) and proteins. The cytoplasm is dehydrated. The spore is surrounded by a spore wall, a cortex (composed of a specific peptidoglycan and calcium dipicolinate), a double tunic consisting of fibrous proteins. The outermost layer is the exosporium.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.