(1) X. Moons shadow creates solar eclipse.
(2) ✓
(3) ✓
(4) covered by the sun
(5)new moon
Ancient Greece brought the form of government called democracy
Answer:
C. The lytic lifecycle allows viruses to reproduce more quickly but also kills the host and forces the virus to find a new host cell.
Explanation:
The lytic lifestyle of the viruses (e.g. bacteriophage) can be described through the next steps:
- attachment and injection into the host cell (e.g.bacterial cell)
- synthesis of the early virus proteins which break down host's DNA
- virus uses host's machinery (for the replication, transcription and translation) to produce the rest of its proteins and to form new virus particles.
- host cell burst and many new virus particles are released.
During the lysogenic cycle, virus does not kill the host. It integrated its DNA into host's genome and stays dormant until conditions are optimal for reproduction.
Answer:
Repression of gene expression
Explanation:
Heterochromatin is formed by highly-packed DNA regions. A functional consequence of heterochromatin formation is that these regions become inaccessible to transcription factors, thereby inhibiting gene transcription (genes in these regions are 'switched off'). Heterochromatin is formed by epigenetic modifications added to histone tails that form nucleosomes, i.e., histones H2A, H2B, H3 and H4. The epigenetic marks include, among others, acetylation and methylation.
